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Related Concept Videos

Accelerating Fluids01:17

Accelerating Fluids

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Surface Tension of Fluid01:22

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Stokes' Law01:20

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Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
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Pressure of Fluids01:14

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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
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Couette Flow01:22

Couette Flow

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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
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Updated: Mar 23, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
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Soft matter dynamics: Accelerated fluid squeeze-out during slip.

W Hutt1, B N J Persson2

  • 1Pfisterer Kontaktsysteme GmbH, Rosenstraße 44, 73650 Winterbach, Germany.

The Journal of Chemical Physics
|April 3, 2016
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Summary
This summary is machine-generated.

Lubricated rubber friction depends on contact time and slip. Lubricant is slowly removed during rest but rapidly during sliding, causing motion to stop, except for stiff polymers where speed increases.

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Area of Science:

  • Tribology
  • Soft Matter Physics
  • Polymer Science

Background:

  • Understanding friction is crucial for material science and engineering.
  • Lubricated contacts involving soft materials like rubber present unique challenges due to complex interface dynamics.

Purpose of the Study:

  • To investigate the influence of stationary contact time and sliding distance on the friction of lubricated rubber.
  • To explore the lubricant removal dynamics at the rubber-polymer interface under different conditions.

Main Methods:

  • Utilized a Leonardo da Vinci experimental setup with a constant driving force.
  • Studied rectangular rubber blocks sliding on smooth polymer surfaces lubricated with glycerol or grease.
  • Analyzed the dependency of friction on stationary contact duration and sliding distance.

Main Results:

  • Observed slow lubricant removal during stationary contact and rapid removal during sliding for typical rubbers.
  • Grease-lubricated surfaces showed motion cessation after short slip distances.
  • Stiff poly(methyl methacrylate) exhibited accelerated sliding and apparent lubricant film thickening.

Conclusions:

  • Transient elastohydrodynamics provides a framework for explaining the observed friction behaviors.
  • The findings highlight the critical role of lubricant film dynamics in soft lubricated contacts.
  • The study offers insights relevant to designing and optimizing interfaces in soft matter applications.